他又没有按时做学校作业。

He's fallen behind with his school work again.

《牛津词典》

昨天老师说我们应该按时交作业。

Yesterday our teacher said we should hand in our homework on time.

youdao

作为一名学生，你应该按时完成作业。

Being a student, you should finish your homework on time.

youdao

So, I ask you to do the problems as and when they're posted.

所以,我要求你们按时按量地完成作业

耶鲁公开课 - 基础物理课程节选

So come to two lectures, one section, and do the work regularly.

下面要完成两个课时,一个课外讨论,按时完成作业

耶鲁公开课 - 聆听音乐课程节选